The ga3ox1b mutation reveals the crosstalk between gibberellin and other phytohormones in controlling the growth and development of female flowers in Cucurbita pepo.

The ga3ox1b mutation causes GA deficiency that specifically impairs female flower growth and sterility in Cucurbita pepo, while male flowers develop normally.

• Why it matters: Understanding how gibberellin interacts with other hormones in flower development can reveal mechanisms controlling sexual dimorphism and reproductive success in plants.
• What they did: Researchers identified a loss-of-function mutation in the GA biosynthetic gene CpGA3ox1B, which reduces GA levels in female flowers, and examined its effects through transcriptomic analysis and hormone treatments.
• The result: The mutation results in small, unopened, and sterile female flowers, with GA3 application rescuing phenotypes, and highlights the mutual exclusion of GA and ethylene signaling pathways in floral development.